Just look at rogue for this example, it’s ending created ambivalence between his new and old coping mechanisms— making him directly confront his trauma of losing Rogue. It shows how although the doctor likes to run and still does— it is not healthy to run from emotions and instead he confronts them.

showing emotion is absolutely not something to criticise, it’s a more emotionally developed version of the doctor, resolving some of his conflicts so that a new audience can jump in easier to watching 15. It’s still shown in a nuanced manner.

His emotionality stems from the conclusion of a part of his arc stemming back decades, how the doctor bottles up his emotions and keeps struggling on forwards. It’s with the help he recieves from Donna as 14 and time he has to reflect that he becomes more emotional.